Abstract: The research was conducted in dry valley in the upper reach of the Minjiang River. Inputs and outputs of various nutrients(N,P,K)for one growing period(15 months)in three fruit tree-crop intercropping systems were investigated and analyzed in order to search for problems of nutrient management and further to find out solutions. Nutrient management inherited the good experience on applying large amount of manure from traditional organic agriculture. The period of applying manure also was suitable for growing crops. The main problems of nutrient management were that application of three elements and their ratios in all crop subsystems of three intercropping systems were quite irrational, and large number of nutrition elements was moved out from systems, causing scarcity of nutrition elements and soil fertility declining of some crop subsystems such as wheat, corn, and potato. Otherwise, P fertilizers were applied excessively in almost all crop subsystems and K fertilizer were extreme in all wheat subsystems and corn subsystems. In accordance with every concrete problems in every crop subsystem of three studied fruit tree-crop intercropping systems, adjustment measures of nutrient management were found out. The suitable ratios of nutrition elements in every crop subsystem were set forth. Further suggestions about nutrient management were also discussed in the paper.

Key words: litter layer, root system, mineral soil, respiration flux, temperature sensitivity, Larix gmelinii plantation.